Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Total CNX Resources Stockholders’ Equity	Non- Controlling Interest
Beginning Balance at Dec. 31, 2018	$ 5,081,743	$ 1,990	$ 2,264,063	$ 2,071,809	$ (7,904)	$ 4,329,958	$ 751,785
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	272,004			190,679		190,679	81,325
Issuance of Common Stock	211	9	202			211
Purchase and Retirement of Common Stock	(115,477)	(129)	(101,558)	(13,790)		(115,477)
Shares Withheld for Taxes	(6,284)			(5,594)		(5,594)	(690)
Amortization of Stock-Based Compensation Awards	36,557		35,076			35,076	1,481
Other Comprehensive Income	126				126	126
Distributions to CNXM Noncontrolling Interest Holders	(47,062)						(47,062)
Ending Balance at Sep. 30, 2019	5,221,818	1,870	2,197,783	2,243,104	(7,778)	4,434,979	786,839
Beginning Balance at Jun. 30, 2019	5,099,995	1,879	2,203,969	2,127,627	(7,819)	4,325,656	774,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	143,960			115,538		115,538	28,422
Issuance of Common Stock	49	1	48			49
Purchase and Retirement of Common Stock	(7,697)	(10)	(7,687)			(7,697)
Shares Withheld for Taxes	(61)			(61)		(61)
Amortization of Stock-Based Compensation Awards	1,781		1,453			1,453	328
Other Comprehensive Income	41				41	41
Distributions to CNXM Noncontrolling Interest Holders	(16,250)						(16,250)
Ending Balance at Sep. 30, 2019	5,221,818	1,870	2,197,783	2,243,104	(7,778)	4,434,979	786,839
Beginning Balance at Dec. 31, 2019	4,962,309	1,870	2,199,605	1,971,676	(12,605)	4,160,546	801,763
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	(624,502)			(679,533)		(679,533)	55,031
Issuance of Common Stock	1,805	8	1,797			1,805
Shares Withheld for Taxes	(1,954)			(1,645)		(1,645)	(309)
Amortization of Stock-Based Compensation Awards	11,909		10,424			10,424	1,485
Equity Component of Convertible Senior Notes, net of Issuance Costs	78,317		78,317			78,317
Purchase of Capped Call	(26,351)		(26,351)			(26,351)
Other Comprehensive Income	335				335	335
Distributions to CNXM Noncontrolling Interest Holders	(41,987)						(41,987)
CNXM Merger	(89,705)	371	725,907			726,278	(815,983)
Ending Balance at Sep. 30, 2020	4,270,176	2,249	2,989,699	1,290,498	(12,270)	4,270,176	0
Beginning Balance at Jun. 30, 2020	4,566,954	1,878	2,261,729	1,495,197	(12,382)	3,746,422	820,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	(188,793)			(204,698)		(204,698)	15,905
Issuance of Common Stock	151		151			151
Shares Withheld for Taxes	(1)			(1)		(1)
Amortization of Stock-Based Compensation Awards	2,503		1,902			1,902	601
Equity Component of Convertible Senior Notes, net of Issuance Costs	10		10			10
Other Comprehensive Income	112				112	112
Distributions to CNXM Noncontrolling Interest Holders	(21,055)						(21,055)
CNXM Merger	(89,705)	371	725,907			726,278	(815,983)
Ending Balance at Sep. 30, 2020	$ 4,270,176	$ 2,249	$ 2,989,699	$ 1,290,498	$ (12,270)	$ 4,270,176	$ 0